ASSERT(3) OpenBSD Programmer's Manual ASSERT(3)
NAMEassert - expression verification macro
SYNOPSIS#include <assert.h>assert(expression);
DESCRIPTION
The assert() macro tests the given expression and if it is false, the
calling process is terminated. A diagnostic message is written to stderr
and the abort(3) function is called, effectively terminating the program.
If expression is true, the assert() macro does nothing.
The assert() macro may be removed at compile time with the cc(1) option
-DNDEBUG.
DIAGNOSTICS
The following diagnostic message is written to stderr if expression is
false:
"assertion \"%s\" failed: file \"%s\", line %d\n", \
"expression", __FILE__, __LINE__);
SEE ALSOcc(1), abort(3)STANDARDS
The assert() macro conforms to ANSI X3.159-1989 (``ANSI C'').
HISTORY
An assert() macro appeared in Version 6 AT&T UNIX.
OpenBSD 2.6 June 9, 1993 1